ive just been to their web site and now am very very tempted to get some!
$3100 for a alloy head flowing 600+hp, machined up for studs, good valves, double springs and moly retainers and locks! IM EXCITED
you could spend close to that doing up some 2v's, but they wont flow near that and wont run on pump fuel.
haha this engine started out being a mild 300hp job lol
brenx, with your 3v's, were they a drop on drive away deal?, what else is involved to converting over to the alloy? ill put my studs+guide plates from my first heads on these.
The AFD's will be more a drop on drive away deal than the 3V's. I didn't want to sacrifice power for a head that won't do what I want it to. AFD would have only made around 500-510hp with my setup, where the CHI make quite a substancial bit more. :) They may suit some other engine setups here. AFD is only local too. They're located in Berwick, Vic.
AFD is or already has in delopment a 4v type alloy head, similar to CHI's 218cc head. It'll be interesting to see what kind of figures an engine pulls with the AFD 4v.
Just check the guides are centred if anyone purchases AFD's or CHI's. I aint seen a set yet with the guides drilled centre on the AFD's. I've been told by Dave @ AFD this has been corrected but in the next post he posted a pic of AFD's just prepped. Guess what? Guides off centre.
There are various places will tell you it's not an issue. Think of it this way, Less room for guide wear if it's not centred.
I've seen a single pair of CHI's been redone for this reason. It's not a major problem, the fix is replace the guides correctly and carefully.
All comes down to individual choice. I may have chosen AFD if the new head was out but I'll never know.
in their web page it says they've delevoped a 4v alloy head with 700hp flow! its in the coming soon section.
All sounds good for cleveland users. Just have to wait for testing to see if they work well. My guess is yes they'll work nicely anyway. I'd like to see a set firsthand to look at the port work.
but brenx didn't you have some problems with your alloy heads when you first fitted them?
Yes, The manifold holes in the head didn't line up. The reason for this is CHI designs their heads only to take their CHI manifold. In short busted a bolt trying to get a manifold on. Too much side pressure.
CHI has since moved the manifold bolts to the stock positioning till their manifold is released. Problem solved. My issue was solved by elongating the manifold holes.
Only other issue I had was fitting my 2v pacemaker 4070 4-1 extractors. They were required to be bent down 10mm. If I'd purchased 4v pacemaker 4075 4-1 extractors this wouldn't have been an issue.
I just wanted to use my close enough to new parts. So it made it difficult. Everything else went like clock work
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Alloy Heads
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